TY - BOOK AU - Boughey,A.S. TI - The cause of variation in the incidence of blackarm disease of cotton in the Sudan Gezira T2 - Mycological papers; 21 AV - PAM SB608.C8B6 PY - 1947/// CY - Kew, Surrey PB - Imperial Mycological Institute KW - Xanthomonas malvacearum ER -